v. i. [ L. intrudere, intrusum; pref. in- in + trudere to thrust, akin to E. threat. See Threat. ] To thrust one's self in; to come or go in without invitation, permission, or welcome; to encroach; to trespass; as, to intrude on families at unseasonable hours; to intrude on the lands of another. [ 1913 Webster ]

Thy wit wants edge
And manners, to intrude where I am graced. Shak. [ 1913 Webster ]

Some thoughts rise and intrude upon us, while we shun them; others fly from us, when we would hold them. I. Watts. [ 1913 Webster ]

v. t. [ imp. & p. p. Intruded; p. pr. & vb. n. Intruding. ] [ 1913 Webster ]

1. To thrust or force (something) in or upon; especially, to force (one's self) in without leave or welcome; as, to intrude one's presence into a conference; to intrude one's opinions upon another. [ 1913 Webster ]

2. To enter by force; to invade. [ Obs. ] [ 1913 Webster ]

Why should the worm intrude the maiden bud? Shak. [ 1913 Webster ]

3. (Geol.) The cause to enter or force a way, as into the crevices of rocks.

Syn. -- To obtrude; encroach; infringe; intrench; trespass. See Obtrude. [ 1913 Webster ]

p. a. (Geol.) Same as Intrusive. [ 1913 Webster ]

n. 1. One who intrudes; one who thrusts himself in, or enters without right, or without leave or welcome; a trespasser. [ 1913 Webster ]

They were all strangers and intruders. Locke. [ 1913 Webster ]

2. Specifically: A person who enters a private residence or place of business with the intention to perform a criminal act; as, killed by an intruder. [ PJC ]

n. A female intruder. [ 1913 Webster ]