slip by

VERB
7 LETTERS · STARTS WITH S

slip by is a valid 7-letter word worth 13 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1L1I1P3B3Y4
1 + 1 + 1 + 3 + 0 + 3 + 4 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does slip by mean?