to have uncertainty regarding something
tener incertidumbre acerca de algo (tener incertidumbre acerca de algo)
"I have serious doubts about his honesty."
"Tengo serias dudas acerca de su honestidad." (tengo serias dudas acerca de su honestidad)
to move suddenly backward in fear or surprise
to gain strength and confidence through past experiences
to sympathize with someone’s pain or situation
to reduce tension after a disagreement
to allow yourself a quiet moment away from distractions
to wait calmly for a good opportunity