The answer is TAP, three letters. Dictionaries define a tap as a light blow, often one you can hear, and that small, audible contact is what Light touch is after; the syndicated Eugene Sheffer puzzle has used TAP for this wording three times. Two other three-letter words compete for the same slot, and the table below shows how to tell them apart.
A tap is the touch you can hear
The distinction is built into the definitions. Dictionary.com defines the verb as striking with a light but audible blow, and the noun as a light, sometimes audible blow and the sound it makes. That sound is the whole character of the word. You tap a microphone to see whether it is live, tap on a door, tap a pencil on a desk, tap a glass before a toast. Each of those touches is light, and each one is meant to be heard.
The history agrees. The verb has meant to give a tap, to strike lightly but audibly, since around 1200, either as a native English word or borrowed from Old French, and either way it is ultimately imitative of the sound of rapping. Mention a knock, a knuckle, a fingertip or a microphone, and TAP is the likely entry even with an empty grid. One USA Today clue spelled it out completely as a light touch to test a mic.
The touchscreen gave TAP a new clue family
Phones changed how this word gets clued. Dictionary.com now carries a sense for making a selection on a touchscreen by tapping a button or icon, and constructors have taken it up, with recent clues for TAP such as touch, like a phone icon, and touch a phone screen. Checkout counters supplied another: a blank followed by to pay, as in tap to pay, has turned up too.
That modern sense is also why TAP is such a dependable fill for this clue. It is the word people actually use for the brief contact of a finger on glass. The other two three-letter fills in the table describe different motions altogether, and neither one would describe what you do to an app icon.
Faucets, wiretaps and dancing shoes
TAP turns up under so many different clues because it is really two words sharing a spelling. The faucet sense is its own word, from Old English, and it produced a second verb meaning to draw liquor from a tap, then to open something up in order to use it. By 1869 that verb also meant listening in secretly, first on telegraph wires, which is where the phone bug clues come from. So a wiretap owes nothing to a light touch; its ancestor is the cask.
By the 1680s a tap could also be a piece of leather or metal fastened to the bottom of a shoe, and by 1944 tap on its own was short for tap-dance. Add the sense of choosing someone for a role, recorded from 1952 and taken from the idea of a tap on the shoulder, and one three-letter entry can be clued as a spigot, a phone bug, a dance, a touchscreen gesture or a light touch.
Touch words from three squares to six
Line up your slot length with the kind of touch the clue describes:
| Letters | Answer | The kind of touch |
|---|---|---|
| 3 | TAP | Light and audible, often a fingertip |
| 3 | PAT | The flat of the hand |
| 3 | DAB | Pressing something on, or blotting it off |
| 4 | KISS | Billiard balls barely meeting |
| 5 | BRUSH | Wording about touching in passing |
| 6 | CARESS | An affectionate touch |
| 6 | STROKE | A gentle sweep of the hand |
All three of the short fills put an A in the middle square, so a crossing there tells you nothing. Chase the first or the last square instead, where every one of them differs.
Kiss and caress in the longer slots
When the slot runs past three squares, the clue usually wants an affectionate or glancing touch instead. At four squares the fill is KISS, and romance is only part of the reason. Dictionaries also define a kiss in billiards as the slight touch of one ball by another, and a New York Times clue once leaned on that sense, asking for slight contact on a pool table. British puzzles have used KISS for this exact clue.
At six squares, CARESS and STROKE both fit, and both have answered this clue in a British quick crossword. They share only the R in the third square, so any other crossing chooses between them. BRUSH, at five, is the one to try when a variant of the clue talks about touching in passing.
