| Under one's command | 23 |
| Under one's charge | 22 |
| Under one's care | 20 |
| Under observation | 17 |
| Under oath at a trial | 21 |
| Under oath | 10 |
| Under no circumstances | 22 |
| Under most favorable conditions | 31 |
| Under lock and __ | 17 |
| Under lock and key | 18 |
| Under line? | 11 |
| Under legal age | 15 |
| Under ideal circumstances | 25 |
| Under Helios's influence | 28 |
| Under hand? | 11 |
| Under guidance | 14 |
| Under guardianship | 18 |
| Under great tension | 19 |
| Under goer? | 11 |
| Under full legal age | 20 |
| Under Fire star | 18 |
| Under favorable circumstances | 29 |
| Under discussion | 16 |
| Under different circumstances | 29 |
| Under development? | 18 |
| Under debate | 12 |
| Under Cupid's spell | 23 |
| Under criticism | 15 |
| Under covers for the night | 26 |
| Under covers | 12 |
| Under cover? | 12 |
| Under cover: Fr. | 16 |
| Under cover, perhaps | 20 |
| Under cover | 11 |
| Under control, in a way | 23 |
| Under control across the board | 30 |
| Under control | 13 |
| Under consideration | 19 |
| Under confinement | 17 |
| Under command | 13 |
| Under closer | 12 |
| Under close scrutiny | 20 |
| Under class man? | 16 |
| Under circumstances? | 20 |
| Under challenge | 15 |
| Under canvas | 12 |
| Under attack, perhaps | 21 |
| Under attack | 12 |
| Under any conditions | 20 |
| Under any circumstances | 23 |
| Under anesthetic | 16 |
| Under an umbrella | 17 |
| Under an elm | 12 |
| Under an assumed name, informally | 33 |
| Under an assumed name, briefly | 30 |
| Under a whammy | 14 |
| Under a strain | 14 |
| Under a stopwatch | 17 |
| Under a spell | 13 |
| Under a quilt, say | 18 |
| Under a parasol, say | 20 |
| Under a parasol, e.g. | 21 |
| Under a microscope | 18 |
| Under a jinx | 12 |
| Under a false name, briefly | 27 |
| Under a false ID | 16 |
| Under a cloud | 13 |
| Under a canopy | 14 |
| Under a black cloud | 19 |
| Under a ban | 11 |
| Under 32 degrees Fahrenheit | 27 |
| Under 21 | 8 |
| Under 20, to most | 17 |
| Under 100 mg per deciliter of this is considered optimal | 56 |
| Under to poets | 15 |
| Under | 5 |
| Undependable person | 19 |
| Undependable group member | 25 |
| Undependable | 12 |
| Undeniably | 10 |
| Undeniable truth | 16 |
| Undeniable success | 18 |
| Undeniable facts | 16 |
| Undeniable | 10 |
| Undemonstrative to the max | 26 |
| Undemocratic types | 18 |
| Undemocratic tendency | 21 |
| Undemocratic law | 16 |
| Undemocratic government | 23 |
| Undemocratic decree | 19 |
| Undemanding, as a job | 21 |
| Undemanding courses | 19 |
| Undemanding classes | 19 |
| Undemanding | 11 |
| Undeluded about | 15 |
| Undelivered by the P.O. | 23 |
| Undeliverable piece of mail | 27 |
| Undeliverable letters: Slang | 28 |
| Undeliverable letter, to a postal worker | 40 |
| Undeliverable letter, in post-office talk | 41 |