noun

• (figuratively) A youthful or inexperienced person; a novice.
  "Ay, that's a colt indeed, for he doth nothing but / talk of his horse, and he makes it a great appropriation to / his own good parts that he can shoe him himself."
• (figuratively) A youthful or inexperienced person; a novice.
  "The bowling is more promising in the colts than in the eleven."
• (figuratively) A youthful or inexperienced person; a novice.
• (nautical, historical) A short piece of rope once used by petty officers as an instrument of punishment.

verb

• (obsolete, transitive) To horse; to get with young.
  "Never talk on't: / She hath been colted by him."
• (obsolete, transitive) To befool.
  "What a plague mean ye to colt me thus?"
• (intransitive) To frisk or frolic like a colt; to act licentiously or wantonly.
  "They shook off their bridles and began to colt."
• (obsolete, slang, transitive) To haze (a new recruit), as by charging a new juryman a "fine" to be spent on alcoholic drink, or by striking the sole of his foot with a board, etc.
  "We watched our opportunity, seized him, and, laying him across a chest, we colted him with a boot-jack until we nearly killed him, he at the time suffering from numerous boils in the nates; and for all this he obtained no redress!"