all-in
com tudo incluído

ask in
to ask somebody in

burst in on
interromper bruscamente

burst in upon
interromper bruscamente

C.-in-C.
Commander in Chief

check-in
check-in

comrade-in-arms
companheiro de armas

drive-in
drive-in

gather in
...gather somebody in / to gather something

GOC-in-C
General Officer Commanding in Chief

HRIP
...Hic Requiescit in Pace (Here rests

in
in a week's time

in loco
in loco

In trans.
In transitu (On the passage)

in vitro
in vitro

in vivo
in vivo

in-flight
in-flight service

in-line
in-line engine

live-in
interno

lock in
to lock oneself in / to get locked in

locked-in
locked-in syndrome

lying-in
lying-in hospital

parent-in-law
sogro

paying-in
paying-in slip

plug-in
plug-in coil

sister-in-law
cunhada

smash in
...somebody's head in / to smash somebody's face

son-in-law
genro

thing-in-itself
coisa em si

walk in
please walk in!