What is "pregnant construction"

Pregnant \Preg"nant\, a. [L. praegnans, -antis; prae before + genere, gignere, to beget: cf. F. pr['e]gnant. See Gender, 2d Kin.]

1. Being with young, as a female; having conceived; great with young; breeding; teeming; gravid; preparing to bring forth.

2. Heavy with important contents, significance, or issue; full of consequence or results; weighty; as, pregnant replies. `` A pregnant argument.''
   --Prynne. `` A pregnant brevity.''
   --E. Everett.

3. Full of promise; abounding in ability, resources, etc.; as, a pregnant youth. [Obs.]
   --Evelyn.

   Wherein the pregnant enemy does much.
   --Shak.

   Pregnant construction (Rhet.), one in which more is implied than is said; as, the beasts trembled forth from their dens, that is, came forth trembling with fright.

n. (context rhetoric English) An utterance in which more is imply than is said, such as "the beasts trembled forth from their dens" (i.e. trembling with fright).