Definition of one-downmanship in English:

one-downmanship

(also one-downsmanship)

noun

  • The art or practice of being or appearing to be at a disadvantage.

Origin

1960s; earliest use found in The Times. From one-down + -manship, after one-upmanship.

Pronunciation

one-downmanship

/wʌnˈdaʊnmənʃɪp/