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We are under no obligation to give him what he wants.
Serving in the army is obligatory for all citizens.
social/family obligation
potential obligations
duty bound to pay taxes
filial duty
moral/legal obligation
have the obligation to do sth; be under an obligation to do sth
shirk/escape one's duty; evade/shirk one's obligation; duck out of an obligation
fulfil/meet/satisfy an obligation; carry out commitments; fulfil/perform one's duty
fulfil/meet/satisfy an obligation; perform one's duties
free sb from/of an obligation
take on/assume a duty; take on/assume/undertake obligations
volunteer as a tutor
participate in voluntary tree planting