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Results found in several dictionaries: Collins, Collaborative Dictionary
keep down 
a  vt + adv 
1  (=not raise) 
she kept her eyes down  no levantó los ojos 
keep your head down or you'll get shot  no levantes la cabeza o te dispararán 
you'll have to keep your head down for 48 hours   (fig) tendrás que mantener al margen durante 48 horas 
  head   A1, A2 
2  (=control) 
 [+anger, rebellion] 
contener, reprimir 
 [+weeds] 
no dejar crecer 
 [+dog] 
sujetar
3  (=limit) 
 [+prices, spending, temperature] 
mantener bajo 
 [+costs, inflation] 
mantener al mismo nivel 
could you keep the noise down?  ¿puedes hacer menos ruido? 
you must try to keep your weight down  tienes que intentar no subir de peso 
4  (=hold back) 
4.1 oprimir 
it's just a way to keep women down  es sólo una forma de oprimir a las mujeres 
PROVERBS you can't keep a good man down : los buenos siempre vuelven 
4.2  (Scol) 
he was kept down another year  tuvo que repetir (año) 
5  (=oppress) 
 [+spirits] 
oprimir
6  (=retain) 
 [+food] 

he can't keep anything down  lo devuelve  or  vomita todo 
b  vi + adv seguir agachado, no levantar la cabeza

Collaborative Dictionary     English-Spanish
keep-alive message n. el mensaje para mantener en vida Reverso General Dictionary 
move down v. 1) degradar (vt), 2) bajar (vi) Reverso General Dictionary 
keep a high profile vt. tratar de llamar la atención Reverso General Dictionary 
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'keep down' also found in translations in Spanish-English dictionary
ralentizzar v. 1) slow down (vt), 2) slow down (refl) Reverso General Dictionary 
aportillar v. 1) break down (vt), 2) tumble down (refl) Reverso General Dictionary 
ralentizar v. 1) slow down (vt), 2) slow down (refl) Reverso General Dictionary 
enlentecer v. 1) slow down (vt), 2) slow down (vi) Reverso General Dictionary 
abrumar v. 1) overwhelm (vt), 2) weigh down (vt), 3) get foggy (refl) Reverso General Dictionary 
embotijar nnpl. keep in jars Reverso General Dictionary 
cubrir las apariencias vt. keep up appearances Reverso General Dictionary 
la contabilidad de partida simple nm. single-entry book-keeping Reverso General Dictionary 
la contabilidad por partida doble nm. double-entry book-keeping Reverso General Dictionary 
la contabilidad por partida simple nm. single-entry book-keeping Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"