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