功不可没

• 工(labor; boatman)ASSOCIATIVE
• 力(strength; power)RADICAL

Merit and achievement come from using strength to labor.

• 不(no; not; negation)ASSOCIATIVE

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 口(mouth; opening)RADICAL
• 丁(man; adult male)PHONETIC

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 氵(water; liquid; juice)RADICAL
• 殳(weapon; club)PHONETIC

Water pressing down and submerging everything like a stick striking downward causes things to disappear.