brasklapp

Etymology
. From bishop Hans Brask (1464–1538), who is said to have hidden a note with the text "To this I am forced and compelled" under a wax seal, thus avoiding execution.

In the sense of reservation, precautionary measure; attested since 1929.

Noun

 * 1) a note hidden beneath a wax sigil
 * 2) reservation issued as a precautionary measure, sometimes secretly
 * 1) reservation issued as a precautionary measure, sometimes secretly