in sign of

in sackcloth and ashes in sad earnest in saecula saeculorum in safety in sail in satisfaction of in sb's claws in sb's debt in sb's employ in sb's eyes in sb's favour in sb's line

mass-produced mass-produced castings mass-produces mass-producing mass-reflex mass-spectrometric mass-storage executive capability mass-storage system mass-to charge ratio mass-transfer valve plate