godan ~く verb / transitive:

• to untie; to unfasten; to unwrap; to undo; to unbind; to unpack
• to unsew; to unstitch
• to solve; to work out; to answer
• to dispel (misunderstanding, etc.); to clear up; to remove (suspicion); to appease
• to dissolve (a contract); to cancel; to remove (a prohibition); to lift (a ban); to raise (a siege)
• to release (from duty); to relieve; to dismiss
• to comb (out); to card; to untangle (hair) ➜ 梳く【すく】