All 3 Uses of

muster
in
Bleak House

The congregation was extremely small and quite a rustic one with the exception of a large muster of servants from the house, some of whom were already in their seats, while others were yet dropping in.†
Chpt 16-18 *

muster = gather

You would pass muster in a crowd, Phil!" says the trooper with a pleasant smile.†
Chpt 25-27

Here Mr. Smallweed, wrought up to the highest pitch by his own eloquence, actually throws Judy at her grandmother in default of anything else, by butting that young virgin at the old lady with such force as he can muster and then dropping into his chair in a heap.†
Chpt 31-33

Definitions:

(1) (muster as in: muster strength or the crew)
to gather
The exact meaning of this sense of muster is often subject to its context. For example:
- "mustered her courage/strength/a smile" -- to gather from within
- "muster the soldiers/crew" -- to gather -- typically for inspection
- "muster volunteers/votes" -- to gather enough to do something
(2) (muster as in: didn't pass muster)
inspection -- especially of soldiers or a crew
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

More rarely, muster can refer to a counting or census. Much more rarely, muster can refer to a call to duty such as compulsory military service or jury duty. In that sense, you may see the expression muster in or muster out. Still more rarely, a muster can refer to a group of peacocks.