WordNet sense 1 (shape one's body into a curl):

curl, curl up

WordNet sense 2 (advance or converge on):

close in

WordNet sense 3 (move into (a station) of trains):

pull in, get in, move in

WordNet sense 4 (pull inward or towards a center):

retract

WordNet sense 5 (direct toward itself or oneself by means of some psychological power or physical attributes):

attract, draw, pull

WordNet sense 6 (draw in as if by suction):

suck in