• to be wrapped up in sg, to sink into sg
• to be absorbed in sg, to be lost in sg, to lose oneself in sg, to pore over sg
• to be lost in admiration
• absorption, engrossment, submergence
• to arise, arose, arisen, to bob up, to come up, to crop up, to emerge, to surface
• an idea presents itself
• to be scarcely able to keep one's head above water