Shakespeare was going for a more literal sense here than a figurative one. He was excepting more witchcraft to have been produced from Desdemona, fracturing what Cassio thought of Othello, despite Othello loving Cassio evermore.
They had a good relationship - Othello trusted Cassio and Cassio respected Othello
Cassio and Othello were very close friends before the play.
Cassio was Othello's lieutenant - his second in command.
When Iago tells Othello Cassio slept with her.
Othello was just out of earshot when Iago talks to Cassio. He has told Othello that he is talking to Cassio about Desdemona but he is really talking about the woman that Cassio is really having an affair with, Bianca. In 'Othello' Iago tricks Othello by planting Desdemona's handkerchief in Cassio's room.
They had a good relationship - Othello trusted Cassio and Cassio respected Othello
Cassio and Othello were very close friends before the play.
Cassio was Othello's lieutenant - his second in command.
When Iago tells Othello Cassio slept with her.
Othello was just out of earshot when Iago talks to Cassio. He has told Othello that he is talking to Cassio about Desdemona but he is really talking about the woman that Cassio is really having an affair with, Bianca. In 'Othello' Iago tricks Othello by planting Desdemona's handkerchief in Cassio's room.
If Desdemona asked a favour on Cassio's behalf, it would look to Othello like she was doing it out of an improper love for Cassio. The harder she argues, the more suspicious it seems to Othello.
Iago sets out to trap Othello by several means. He persuades Desdemona to plead for Cassio and persuades Othello that Desdemona pleading for Cassio proves she is in love with him. He steals the handkerchief, persuades Othello that she has given it away to Cassio, then gives it to Cassio himself. He gets lucky as Cassio gives it to Bianca and she returns it in Othello's sight. He talks to Cassio about Bianca, telling Othello who can see (but not hear) that he is talking about Desdemona. All of this circumstantial evidence bolsters the outright lies that Iago tells about Cassio admitting to having an affair with Desdemona.
Lieutenant.
Iago tells Cassio that he must persuade Othello to reinstate him. He says "the general's wife is now our general" and so the best way to persuade Othello is to get Desdemona to plead on Cassio's behalf. Since Iago has also told Othello that Desdemona and Cassio are having an affair, the harder Desdemona pleads, the worse it is going to look for both her and Cassio.
Othello was just out of earshot when Iago talks to Cassio. He has told Othello that he is talking to Cassio about Desdemona but he is really talking about the woman that Cassio is really having an affair with, Bianca.
Iago wanted Cassio to drink more wine because he wanted Cassio to be drunk and argumentative when Roderigo would approach him later that night. Iago told Montano that Cassio was drunk every night. He wanted to cast doubt on Othello's judgment for appointing Cassio, by implying that Cassio may be drunk during battle. This led to Othello stripping Cassio of his position. Othello thought that Cassio was irresponsible and dishonourable.
cassio,bianca,othello,desdemona,lodovico