The Music Stem / The Musician's Library / Composer's Handbook / Suspension
Composer's Handbook
A suspension holds a note from one chord into the next, where it clashes and then resolves down by step.
Prepare F in the chord before, hold it over a C chord and then resolve it to E.
F major (F in the top voice) moves to C major. F holds (the 4) and falls to E (the 3): a 4–3 suspension.