deobstuppatio

deobstuppatio [cf. obstuppatio] , clearance (of watercourse) from obstruction. s1331 [abbas] multum laborabat ‥ cum aliis abbatibus et dominis ‥ pro deobstupac[ione] de Welledam facienda Chr. Rams. app. 352; 1375 causa apparicionis [i. e. apercionis] et deobstupacionis sewerarum et fossatorum ‥ prioris (Anc. Indict.) Pub. Works I 285.