Sidle often suggests moving with stealth, trying to go unnoticed. The cat sidled towards the unsuspecting bird.
Pro Tip 2/3
Negative Association
Using 'sidle' can imply a negative or ulterior motive for moving discreetly. He sidled up to eavesdrop on the conversation.
Pro Tip 3/3
Cautious Approach
The word often conveys a sense of caution, as in approaching something dangerous or uncertain. She sidled towards the edge of the cliff, careful not to slip.