Dic: Synonyms: force, compel, coerce, constrain, oblige, obligate

These verbs mean[:]

to cause a person or thing to follow a prescribed or dictated course. 

• Force, the most general, usually implies the exertion of physical power or the operation of circumstances that permit no options:
  ... Tear gas forced the fugitives out of their hiding place.
• Compel applies especially to an act dictated by one in authority:
  ... Say nothing unless you're compelled to.
• Coerce invariably implies the use of strength or harsh measures in securing compliance:
  ... "The man of genius rules . . . by persuading an efficient minority to coerce an indifferent and self-indulgent majority" (James Fitzjames Stephen).
• Constrain suggests that one is bound to a course of action by physical or moral means or by the operation of compelling circumstances:
  ... "I will never be by violence constrained to do anything" (Elizabeth I).
• Oblige implies the operation of authority, necessity, or moral or ethical considerations:
  ... "Work consists of whatever a body is obliged to do" (Mark Twain).
• Obligate applies when compliance is enforced by a legal contract or by the dictates of one's conscience or sense of propriety:
  ... I am obligated to repay the loan.

.... The American Heritage

Obligate, obligated to do something:

• The ruling obligates airlines to release information about their flight delays.
• He felt obligated to help.

verb| If something obligates you to do a particular thing, it creates a situation where you have to do it.[ FORMAL ]

adjective| obligated (to do something): having a moral or legal duty to do something

verb| 1. To bind, compel, or constrain by a social, legal, or moral tie.

.... Cobuild, OALD, The American Heritage