Word Study
let off |
let on |
let out |
let pass |
let ride |
let slide
| let slip
| let the cat out of the bag
| let up
| let well enough alone
| let-alone
let slide
THESAURUS
let slide
be caught napping, be neglectful, be negligent, default, disregard, fail, gloss over, ignore, lapse, let go, let pass, let ride, let slip, lose sight of, lose track of, neglect, nod, not care for, not get involved, not heed, not think, overlook, pass over, procrastinate, sleep, take for granted
For further exploring for "let slide" in Webster Dictionary Online