call on

Từ điển WordNet v3.1 - WordNet Dictionary

verb

have recourse to or make an appeal or request for help or information to (Freq. 8)
- She called on her Representative to help her
- She turned to her relatives for help
• Syn:
turn
• Hypernyms:
appeal, invoke
• Verb Frames:
- Somebody ----s somebody
- Somebody ----s somebody to INFINITIVE
- They call on him to write the letter