This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A wire stretched near ground level to trip or ensnare an enemy.

n. A wire or line that activates a weapon, trap, or camera, for example, when pulled.

n. A small military force whose involvement in hostilities will trigger the use of a larger force.

n. A cord or wire arranged so that when snagged or pulled by an intruder, it will trigger a detector or trap or a device, such as a land mine.

n. Any means of detecting intruders.

"No mention that the "tripwire" came when Limbaugh said he hoped Obama fails, four days before Obama was inaugurated."

land mine    explosive   

tripline    trip cord   

journey    cat's cradle    planet    gentleman    question    business    public    monsters'    package    whitehorned