急く is read as せく (seku) and means to hurry.
せく
seku
きゅう
(in gagaku or noh) end of a song
きゅうきょ
sudden
きゅうこう
express (train)
いそぐ
to hurry
きゅうびょう
sudden illness
いそいで
hurry up!
きゅうよう
urgent business
せかす
to hurry (up)
きゅうぴっち
quick pace
きゅうし
sudden death
いそぎ
haste
きゅうば
emergency