| way of thinking | | | |
| way out of a paper bag | | | |
| WD-40 | | | |
| weaker vessel | | | |
| weak sister | | | |
| weak tea | | | |
| weaponized incompetence | | | |
| we are where we are | | | |
| wear one's heart on one's sleeve | | | |
| wear out one's welcome | | | |
| wear rose-colored glasses | | | |
| wear sackcloth and ashes | | | |
| wear the trousers | | | |
| wear thin | | | |
| wear too many hats | | | |
| wear yellow stockings | | | |
| weasel into | | | |
| weasel out | | | |
| weather the storm | | | |
| we been knew | | | |
| wedding | | | |
| wedding-cake | | | |
| weed out | | | |
| week in, week out | | | |
| weep Irish | | | |
| we have company | | | |
| we haven't got all day | | | |
| weigh against | | | |
| weigh down | | | |
| weigh in | | | |
| weight of the world | | | |
| weigh up | | | |
| welcome to my world | | | |
| welfare Cadillac | | | |
| well and good | | | |
| well and truly | | | |
| well done | | | |
| well, I never | | | |
| well-oiled | | | |
| well-oiled machine | | | |
| well-seen | | | |
| Welsh comb | | | |
| Welsh-comb | | | |
| were you born in a tent | | | |
| wet behind the ears | | | |
| wet blanket | | | |
| wet-blanket | | | |
| wet boy | | | |
| wet dream | | | |
| wet firecracker | | | |
| wet one's beak | | | |
| wet one's pants | | | |
| wet one's whistle | | | |
| wet the bed | | | |
| wet the shamrock | | | |
| whack-a-mole | | | |
| whack one out | | | |
| whack up | | | |
| what are the odds | | | |
| what can I say | | | |
| what can I tell you | | | |
| what did your last slave die of | | | |
| what do you say | | | |
| whatever creams your twinkie | | | |
| whatever floats your boat | | | |
| whatever helps you sleep at night | | | |
| whatever it takes | | | |
| what for | | | |
| what happens twice happens thrice | | | |
| what in tarnation | | | |
| what in time | | | |
| what is more | | | |
| what it takes | | | |
| what, me worry | | | |
| what not | | | |
| what of it | | | |
| whatsamatta | | | |
| what's cooking | | | |
| what's eating | | | |
| what's eating you | | | |
| what's going on | | | |
| what's in it for me | | | |
| what's it to you | | | |
| what's new | | | |
| what someone said | | | |
| what's the beef | | | |
| what's the difference | | | |
| what's the good of | | | |
| what's the matter | | | |
| what's the story | | | |
| what's the story, bud | | | |
| what's up | | | |
| what's what | | | |
| what's your poison | | | |
| what the Devil | | | |
| what the doctor ordered | | | |
| what was someone smoking | | | |
| what was someone thinking | | | |
| what with | | | |
| what you see is what you get | | | |