incumbent
Translation
obligatory, necessary, current, in office
Examples
It is incumbent upon you to tell the truth.
It is your duty to tell the truth.
The incumbent president faces a tough election.
The current president faces a tough election.
The new candidate challenged the incumbent.
The new candidate challenged the current office-holder.
Grammar Patterns
it is incumbent ((upon/on sb.)) ((to-inf)) it is sb's duty to do sth. It is incumbent upon you to tell the truth.
the incumbent ((as a noun)) the current holder of a post The new candidate challenged the incumbent.
Similar Words
Synonyms: obligatory, mandatory, required; Noun: office-holder.
Etymology
From Latin 'incumbere', meaning 'to lie or lean on'. 'in-' (upon) + 'cumbere' (to lie down).
Memory Tips
Imagine someone 'lying' (cumbere) 'in' (in-) the office chair; they are the incumbent.