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to fathom why

to fathom why

4 7.0
To understand the reason for something that seems puzzling
  • phrasal verb
translation icon : entender por qué
  • I cannot fathom why so many previous comments are hostile.
  • hard to fathom why
  • difficult to fathom why
  • still can't fathom why

Like, I couldn't fathom why you would want to do that job, right?

Examples

  • Martin couldn't fathom why everything was so complicated.

    Fiction book (1996)
  • At this point, I cannot fathom why that seemed so bad, frankly.

    Blog text (9)
  • None of them could fathom why this should be so.

    Fiction book (1994)
  • It's really not that hard to fathom why this poorly placed sign might pose a risk.

    Blog text (5)
  • I just can't fathom why you did it.

  • I can't even fathom why this happened.

    Blog text (26)
  • Norman couldn't begin to fathom why she would want to start over as a lab tech, but there it was.

    Fiction book (2002)
  • They could not fathom why Defoe was reluctant to turn in people who saved his life.

    Fiction book (2000)
  • I can't fathom why they'd pass up the Smithsonian for the dumpster.

    Blog text (9)
  • I can never quite fathom why he makes those peculiar choices.

Synonyms

to grok
vsto fathom why
  • Jargon
3 9.9

To understand something deeply and naturally

focuses on finding a reason for puzzling or difficult cases

How Understood

to fathom why
4 7.0
to grasp
146 4.1
to understand
1.0
to think
1.0
to suspect
925 3.6
to guess
1.0

Surface Forms

fathom why infinitive
fathomed why past participle
fathoming why present participle
fathoms why third person singular

Morphology

fathom + why

The meaning is directly compositional: 'fathom' means to comprehend and 'why' refers to the reason, so a learner who knows both words can infer 'to understand the reason for something'. The combination follows a straightforward verb + noun pattern found across languages, making the MWE transparently interpretable.

Etymology

The phrase fathom why comes from old sailors. Sailors used a marked rope called a 'fathom' to measure the sea and find its bottom, so to fathom something came to mean 'reach the bottom' of an idea, and that's why fathom why means 'to understand the reason'.