muster

American  

[muhs-ter] / ˈmʌs tər /

verb (used with object)

1. to assemble (troops, a ship's crew, etc.), as for battle, display, inspection, orders, or discharge.

   Synonyms:

   congregate, convene, convoke

   Antonyms:

   separate, scatter

2. to gather, summon, rouse (often followed byup ).

   He mustered all his courage.

---

verb (used without object)

1. to assemble for inspection, service, etc., as troops or forces.

2. to come together; collect; assemble; gather.

   Synonyms:

   congregate, convene

   Antonyms:

   separate, scatter

noun

1. an assembling of troops or persons for formal inspection or other purposes.

   Synonyms:

   convention, assembly, gathering

2. an assemblage or collection.

3. the act of mustering.

4. Also called muster roll.  (formerly) a list of the persons enrolled in a military or naval unit.

verb phrase

1. muster out to discharge from service in the armed forces.

   He will be mustered out of the army in only two more months.

2. muster in to enlist into service in the armed forces.

idioms

1. pass muster,

   1. to pass a cursory inspection.

   2. to measure up to a certain standard; be adequate.

      Your grades don't pass muster.

muster British  

/ ˈmʌstə /

verb

1. to call together (numbers of men) for duty, inspection, etc, or (of men) to assemble in this way

2. 1. to enlist into military service

   2. to discharge from military service

3. (tr) to round up (livestock)

4. to summon or gather

   to muster one's arguments

   to muster up courage

---

noun

1. an assembly of military personnel for duty, inspection, etc

2. a collection, assembly, or gathering

3. the rounding up of livestock

4. a flock of peacocks

5. to be acceptable

muster More Idioms  

More idioms and phrases containing muster

• pass muster

---

Related Words

See gather.

Other Word Forms

• premuster verb (used with object)
• unmustered adjective

Etymology

Origin of muster

1250–1300; Middle English mostren (v.) < Old French mostrer < Latin mōnstrāre to show, derivative of mōnstrum unnatural event; monster

Example Sentences

One of them is unable to muster a genuine-looking smile and the other looks rightly embarrassed.

From The Wall Street Journal • Apr. 2, 2026

It found that this requirement passed First Amendment muster because it regulated speech “only as part of the practice of medicine.”

From Slate • Mar. 31, 2026

He was, however, still able to muster some optimism.

From BBC • Mar. 26, 2026

Both Anduril and ExoAnalytic Solutions are privately held and did not disclose terms of the deal, which still has to pass regulatory muster.

From Los Angeles Times • Mar. 12, 2026

As I waved back to her little brothers, I had an idea that would take all the courage I could muster.

From "Hope Springs" by Jaime Berry