CHACK
Etymology 1
Verb
chack (third-person singular simple present chacks, present participle chacking, simple past and past participle chacked)
To toss up the head frequently, as a horse to avoid the restraint of the bridle.
Etymology 2
Verb
chack (third-person singular simple present chacks, present participle chacking, simple past and past participle chacked)
(ice-skating) To not broadcast a medal-winning or otherwise memorable or crucial figure skating performance. This only occurs in a live broadcast because the network has to decide which programs to show and which to cut in the interest of time. If a skater is low in the rankings and several big names are set to skate later, that performance may be cut.
Etymology 3
Imitative.
Verb
chack (third-person singular simple present chacks, present participle chacking, simple past and past participle chacked)
Of birds: to make a sudden harsh call.
Etymology 4
Noun
chack (plural chacks)
A snack or light hasty meal.
Source: Wiktionary