Strength under control — not weakness but power disciplined by love. The meek man is not a pushover but someone who has brought his power under the authority of God. Moses (Num 12:3) and Jesus (Matt 11:29) exemplify this.
Classical Greek used prautes of the tamed horse — full power, fully controlled. The NT applies it to the Christian who has brought their full capacity under Christ's lordship. 'Meek' in English often sounds weak; the Greek is strong.
1 Peter 3:15's apologetic instruction — give a defense with prautes — shows this is not passive silence but active, confident, gentle engagement. The meek can contend without being combative.