2347 thlipsis (thlip'-sis);

from 2346; pressure (literally or figuratively):

KJV-- afflicted (-tion), anguish, burdened, persecution, tribulation, trouble.

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2346 thlibo (thlee'-bo);

akin to the base of 5147; to crowd (literally or figuratively):

KJV-- afflict, narrow, throng, suffer tribulation, trouble.