Also see definition of "Threshold" in Word Study
Study Dictionary
Threshold
Threshold [EBD]
(1.) Heb. miphtan, probably a projecting beam at a higher point than the threshold proper (1 Sam. 5:4,5; Ezek. 9:3; 10:4,18; 46:2; 47:1); also rendered "door" and "door-post."
(2.) 'Asuppim, pl. (Neh. 12:25), rendered correctly "storehouses" in the Revised Version. In 1 Chr. 26:15, 17 the Authorized Version retains the word as a proper name, while in the Revised Version it is translated "storehouses."
THRESHOLD [SMITH]
Of the two words so rendered is the Authorized Version, one,miphthan, ,seems to mean sometimes a projecting beam or corbel. (Ezekiel 9:3; 10:4,18)Also see definition of "Threshold" in Word Study