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Etymology
From.

Verb

 * 1)  to tread, to step
 * 2)  to follow, to ensue, to take place, to occur, to happen
 * 3)  to succeed to
 * 4)  to approach, to come closer
 * 5)  to attack
 * 6)  to threaten, to endanger
 * 1)  to attack
 * 2)  to threaten, to endanger