Senses
合当/ 合當 should
should; ought to; must
合当/ 合當 to be appropriate
to be suitable or appropriate; to fit well, especially in the context of personal relationships or behavior
合当/ 合當 to be on duty
to be on shift or on duty, especially referring to a government clerk or official
合当/ 合當 fated
to be fated or destined to do something