To move in a furtive or stealthy manner, often sideways.

To approach someone quietly or cautiously, often in a sneaky way.

चुपचाप या सतर्कता से किसी के पास आना

English Usage: The cat sidled up to the mouse, ready to pounce.

Hindi Usage: बिल्ली चूहों के पास चुपके से गई, तैयार होकर कूदने के लिए।