will power noun
ADJ. sheer | strong
VERB + WILL POWER have I'm no good at slimming. The trouble is, I've got no will power. | take It took all his will power to stay in and study. | summon He tried to summon the will power to get out of bed. | need
PREP. by ~ She managed to finish the race by sheer will power.
You can also check other dicts: will power (English, 中文解释 ), wordnet sense, Collins Definition