chukker(n = noun.time) chukka - (polo) one of six divisions into which a polo match is divided;
is a kind of division, part, section
is a part of period of play, play, playing period

chukker, n. (also chukka) each of the periods of play into which a game of polo is divided.

Idiom:
chukka boot an ankle-high leather boot as worn for polo.

Etymology:
Hindi cakkar f. Skr. cakra wheel