-ku Godan/u-verb

1. to untie; to unfasten; to unwrap; to undo; to unbind; to unpack
2. to unsew; to unstitch
3. to solve; to work out; to answer
4. to dispel (misunderstanding, etc.); to clear up; to remove (suspicion); to appease
5. to dissolve (a contract); to cancel; to remove (a prohibition); to lift (a ban); to raise (a siege)
6. to release (from duty); to relieve; to dismiss
7. usually kana to comb (out); to card; to untangle (hair) (also written as 梳く)

-ku Godan/u-verb

1. to comb (out); to card; to untangle (hair)
2. to thin (hair); to reduce in volume