fathom

(also figuratively) To measure the depth of (water); to take a sounding of; to sound.

(archaic or obsolete) To encircle (someone or something) with outstretched arms; specifically, to measure the circumference or (rare) length of something.

(figuratively) Often followed by out: to deeply understand (someone or something); to get to the bottom of.

(obsolete) To embrace (someone or something).

To measure a depth; to sound.

(figuratively) To conduct an examination or inquiry; to investigate.