BT Pes 116a(12) :לסמוכיה‏ : to make it (the ḥaroseth) thick
See the entire entry for smk vb. to prop up, to support

BT Pes 116a(12) :הולכך צריך לקיוהיה וצריך לסמוכיה לקיוהיה זכר לתפוח לסמוכיה זכר לטיט‏ : therefore it is necessary to make it sour and to make it thick, to make it sour in memory of the apple, thick in memory of the mud
See the entire entry for qwh vb. to become sour