Concentrate and Rack one's brains

Concentrate verb - To increase the amount of (a substance in a mixture) by removing other substances.

Rack one's brains and concentrate are semantically related In some cases you can use "Rack one's brains" instead a verb "Concentrate".

Nearby Words: concentrated, concentration, concentrating, concentric, concentrator

Concentrate and rack one's brains are semantically related in think hard topic. You can use "Concentrate" instead a verb phrase "Rack one's brains".