Roget's Thesaurus: Entry 233 (Limit)

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#233. Limit. -- N. limit, boundary, bounds, confine, enclave, term, bourn, verge, curbstone[obs], but, pale, reservation; termination, terminus; stint, frontier, precinct, marches; backwoods.

boundary line, landmark; line of demarcation, line of circumvallation[obs]; pillars of Hercules; Rubicon, turning point; ne plus ultra[Lat]; sluice, floodgate.

Adj. definite; conterminate|, conterminable[obs]; terminal, frontier; bordering.

Adv. thus far, thus far and no further.

Phr. stick to the reservation; go beyond the pale.