Word meanings
Strong's dictionary
from שָׁמַר; a guard (the man, the post or the prison); a deposit (figuratively); also (as observed) a usage (abstractly), or an example (concretely); diligence, guard, office, prison, ward, watch.
Strong's Exhaustive Concordance (public domain)
Full lexicon entry (Brown-Driver-Briggs)
מִשְׁמָר n.[m.] place of confinement, gaol, prison; late, guard, watch, observance
Every occurrence
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Proverbs 4:23 מִ֭שְׁמָר Mish.mor · A person, place or thing
Keep thy heart with all diligence; For out of it are the issues of life.
American Standard Version (1901). Public domain.