let slip (?.)

• abandon
• babble
• be bereaved of
• be caught napping
• be indiscreet
• be neglectful
• be negligent
• be unguarded
• betray
• betray a confidence
• blab
• blabber
• blurt
• blurt out
• brush aside
• brush off
• default
• dismiss
• disregard
• drop
• drop the subject
• fail
• forfeit
• forget
• forget about it
• forget it
• give away
• gloss over
• go astray from
• ignore
• incur loss
• inform
• inform on
• kiss good-bye
• lapse
• lay aside
• leak
• let drop
• let fall
• let go
• let it go
• let pass
• let ride
• let slide
• lose
• lose out
• lose sight of
• lose track of
• mislay
• misplace
• miss
• neglect
• nod
• not care for
• not get involved
• not heed
• not think
• overlook
• pass over
• peach
• procrastinate
• push aside
• put aside
• rat
• reveal a secret
• sacrifice
• set aside
• shrug off
• sing
• sleep
• sneeze at
• spill
• spill the beans
• squeal
• stool
• suffer loss
• take for granted
• talk
• tattle
• tattle on
• tell on
• tell secrets
• tell tales
• think nothing of
• thrust aside
• turn away from
• undergo privation
• wander from