seize upon

Short definition from Wiktionary

Verb

1. 1
   To grasp or take hold of (an object) suddenly, forcibly, or tightly.
2. 2
   To take up, embrace, enact, or turn eagerly to (a plan, idea, ideology, cause, practice, method, etc.); to grasp, understand, and accept quickly; to adopt wholeheartedly or vigorously.
3. 3
   To take possession of or claim (an idea, person, event, etc.) as one's own; to assimilate, absorb, annex, co-opt.