side letter
n.— «The situation was so dire in Peabody the School Committee last week passed what’s called a “side letter” to the teachers’ contract, a first for the district. The decision allows administrators to offer higher pay to new teachers in “critical shortage” areas: chemistry, mathematics and Spanish.» —“Demand up for teachers; districts hire until the last minute” by Stacie N. Galang Salem News (Massachusetts) Aug. 29, 2007. (source: Double-Tongued Dictionary)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...