| Be on tenterhooks | 17 |
| Be on the back of | 17 |
| Be on the ballot | 16 |
| Be on the board? | 16 |
| Be on the bottom | 16 |
| Be on the bottom? | 17 |
| Be on the brink | 15 |
| Be on the brink of toppling | 27 |
| Be on the federal payroll while collecting a pension | 52 |
| Be on the fence | 15 |
| Be on the hook for | 18 |
| Be on the horizon | 17 |
| Be on the lam | 13 |
| Be on the lookout | 17 |
| Be on the lookout, maybe | 24 |
| Be on the make with | 19 |
| Be on the mend | 14 |
| Be on the payroll | 17 |
| Be on the precipice | 19 |
| Be on the same page | 19 |
| Be on the same wave-length | 26 |
| Be on the same wavelength as | 28 |
| Be on the short end | 19 |
| Be on the side of caution? | 26 |
| Be on the take | 14 |
| Be on the ticket | 16 |
| Be on the up and up? | 20 |
| Be on the verge of falling | 26 |
| Be on the wagon | 15 |
| Be on the way out | 17 |
| Be on time for | 14 |
| Be on TV | 8 |
| Be on ___ with (equal) | 22 |
| Be one of the crowd | 19 |
| Be one of the gang | 18 |
| Be one's own doctor | 23 |
| Be open to learning new things | 30 |
| Be openhanded with? | 19 |
| Be openmouthed | 14 |
| Be operated on | 14 |
| Be opportunistic | 16 |
| Be opportunistic, in a way | 26 |
| Be optimistic | 13 |
| Be optimistic, no matter what | 29 |
| Be or end follower | 18 |
| Be organized, in a way | 22 |
| Be original, but not first | 26 |
| Be otiose | 9 |
| Be out briefly? | 15 |
| Be out of | 9 |
| Be out of control | 17 |
| Be out of harmony | 17 |
| Be out of sorts | 15 |
| Be out, perhaps | 15 |
| Be outmatched | 13 |
| Be outrageous | 13 |
| Be outscored at the end | 23 |
| Be outspoken | 12 |
| Be outstanding | 14 |
| Be outstanding? | 15 |
| Be over by | 10 |
| Be over the top, while acting | 29 |
| Be over with | 12 |
| Be overabundant | 15 |
| Be overattentive, as a waiter | 29 |
| Be overcome with emotion (Sl.) | 30 |
| Be overdramatic | 15 |
| Be overdrawn | 12 |
| Be overfilled | 13 |
| Be overflowing | 14 |
| Be overfond | 11 |
| Be overfond of | 14 |
| Be overfull | 11 |
| Be overhasty | 12 |
| Be overindulgent | 16 |
| Be overly ambitious | 19 |
| Be overly avid | 14 |
| Be overly confident, say | 24 |
| Be overly fond | 14 |
| Be overly fond of | 17 |
| Be overly inquisitive | 21 |
| Be overly optimistic with one's archeological work | 54 |
| Be overly persistent | 20 |
| Be overly petty | 15 |
| Be overly picky | 15 |
| Be overly sentimental | 21 |
| Be overly sweet | 15 |
| Be overrun | 10 |
| Be overrun (with) | 17 |
| Be oversentimental | 18 |
| Be overtheatrical | 17 |
| Be overthrown | 13 |
| Be overwhelmed with emotion | 27 |
| Be paid, as a salary | 20 |
| Be paralyzed by money woes? | 27 |
| Be parasitic | 12 |
| Be parental | 11 |
| Be parsimonious | 15 |
| Be part of a crew | 17 |
| Be part of a get-hitched-quick scheme | 37 |