85 entries under idiom topic. ×

5
sine qua non(noun, expression, condition, need)
3
call of duty(noun, expression, burden, responsibility)
3
sense of obligation(noun, expression, appreciation, recognition)
2
bounden duty(expression, duty)
2
good deed
1
act of grace
1
act of kindness
1
below the line(noun, expression, damage, balance)
1
discharge an obligation(expression, duty, observance)
1
duties and responsibilities
1
fulfill an obligation(expression, duty, observance)
1
holding the bag(noun, expression, charge, concern)
1
in the hole(noun, expression, damage, balance)
1
in the red(noun, expression, damage, balance)
1
labor of love
1
life or death(expression, need, essential, requirement)
1
line of duty
1
moral obligation(noun, expression, burden, responsibility)
1
perform an obligation(expression, duty, observance)
1
redeem one's pledge(expression, duty, observance)
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APASmart Define. (2015). obligation thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/obligation/thesaurus/synonyms
ChicagoSmart Define. 2015. "obligation thesaurus" https://smartdefine.org/obligation/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, obligation thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/obligation/thesaurus/synonyms>.
MLASmart Define. "obligation thesaurus" 22 December 2015. Web. 26 September 2026. <https://smartdefine.org/obligation/thesaurus/synonyms>