Definitions from Wiktionary ( )

▸ noun:  The lowermost part of a doorway that one crosses to enter; a sill.
▸ noun:  (by extension) An entrance; the door or gate of a house.
▸ noun:  (by extension) Any end or boundary.
▸ noun:  (figurative) The outset of something; the point of entry, or the beginning of an action.
▸ noun:  (aviation) The start of the landing area of a runway.
▸ noun:  (engineering) The quantitative point at which an action is triggered, especially a lower limit.
▸ noun:  The wage or salary at which income tax becomes due.
▸ noun:  The point where one is mentally or physically vulnerable in response to a provocation or to other nuisances.

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